EP1454070B1 - Ecrou, boulon et vis de securite - Google Patents

Ecrou, boulon et vis de securite Download PDF

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Publication number
EP1454070B1
EP1454070B1 EP02785629A EP02785629A EP1454070B1 EP 1454070 B1 EP1454070 B1 EP 1454070B1 EP 02785629 A EP02785629 A EP 02785629A EP 02785629 A EP02785629 A EP 02785629A EP 1454070 B1 EP1454070 B1 EP 1454070B1
Authority
EP
European Patent Office
Prior art keywords
fastener
tool
head
curved
nut
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02785629A
Other languages
German (de)
English (en)
Other versions
EP1454070A1 (fr
Inventor
Zbigniew Oleszek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP1454070A1 publication Critical patent/EP1454070A1/fr
Application granted granted Critical
Publication of EP1454070B1 publication Critical patent/EP1454070B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/02—Spanners; Wrenches with rigid jaws
    • B25B13/06—Spanners; Wrenches with rigid jaws of socket type
    • B25B13/065—Spanners; Wrenches with rigid jaws of socket type characterised by the cross-section of the socket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B13/00—Spanners; Wrenches
    • B25B13/48—Spanners; Wrenches for special purposes
    • B25B13/485—Spanners; Wrenches for special purposes for theft-proof screws, bolts or nuts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0069—Specially shaped nuts or heads of bolts or screws for rotations by a tool with holes to be engaged with corresponding pins on the tool or protruding pins to be engaged with corresponding holes on the tool

Definitions

  • the present invention relates to security nuts, bolts and screws which for brevity will be termed hereafter as "screwed fasteners”.
  • Screwed fasteners mainly fall into two categories, firstly those which can be screwed into something to fasten an item with usually a common tool such as a screwdriver. This category cannot be unscrewed using the same tool, thus some security is ensured but unfastening is only possible by cutting the head off the screw.
  • An example is a woodscrew having a transverse slotted head with one side of the slot sloped so that rotation of an applied bladed screwdriver engages with the screw in only one direction.
  • a second category of screwed fastener is that which requires a special tool to engage in the bolt or screwhead or nut.
  • This head or nut is configured as to make it difficult for a wrench to grip.
  • security relies on limited availability and possession of the special tool.
  • An example is a nut in the head of which is a narrow (1.5mm) and comparatively deep (2mm)annular groove. Drilled into the bottom of the groove are fine (1.2-1.5mm) holes which are parallel to but obviously displaced from the nut's axis.
  • the special tool has pins extending from it which fit the holes in the head of the nut so that torque on the tool in either direction will turn the nut.
  • Unfortunately because the holes and pins are necessarily fine - there being little room on the head of the nut outside the threaded centre - the torque which can be applied before fracture of the pins is not great. As a result tools are frequently broken or nuts not sufficiently tightened.
  • Another kind of security nut of the second category (see GB Patent No 943,521) which is more robust has a conical head in which there are usually a pair of opposed straight slots in the conical surface of the head which extend at the same angle as the cone in a diametrical plane of the nut's axis.
  • This overcomes problems with the transmission of torque since the slots can provide a much larger engagement surface with the tool of the pin type described above.
  • security is much poorer than the pin type because a common wrench or gripping tool can grip the slots to undo the nut or else the nut can be rotated by hammering a screwdriver inserted into one of the slots.
  • GB Patent Publication No 2,169,978 A A further type of nut with a head shaped as in GB 993,521 is shown in GB Patent Publication No 2,169,978 A. This has a single helical groove around a conical head of a nut. The single groove does not enable torque to be applied in both clockwise and anticlockwise directions.
  • a security screw fastener has a head around which is a tool receiving curved exterior surface, the surface being at least partially conical or dome shaped, characterised in that several left handed and right handed grooves are formed in the curved surface for receiving a projection from an interior surface of a cooperating tool for turning the fastener.
  • a security arrangement comprising the fastener according to the aforesaid first aspect and the aforesaid cooperating tool.
  • the effect of having preferably several helical grooves on the outer curved surface of the fastener together with the conical or domed shape of the surface is to provide so poor a gripping surface for a wrench or other form of gripping tool that insufficient torque can be applied to unscrew the fastener assuming the fastener has been adequately tightened in the first place.
  • the helical groove(s) furthermore provide no abutment surface for a tangentially applied unscrewed force from say a hammered screwdriver.
  • Trials indicate that the helical grooving is best formed as a three start thread and the tool should fit with its interior surface as near as possible shaped to conform with the outer curved surface of the fastener.
  • the tool is conveniently formed by drilling holes in the interior surface into which balls are pressed to provide the necessary projections.
  • the helical grooving is both left and right handed so as to enable screwing and unscrewing.
  • the M8 nut generally shown in figures 1 and 2 at 1 has an outer form which without the central tapped hole 2 in head 3 could equally be applied to the head of a bolt or screw.
  • Head 3 has a main conically curved outer surface 5 having a cone angle ⁇ of about 50° and an outside and lower diameter of 16mm. This angle as will be explained below, although it can be within the range of 40° to 60°, is critical for good torque transmission.
  • a domed surface 8 Continuing from the conical surface 5 with an interruption 6 is a domed surface 8 with a 2mm radius at 9. The domed surface is based on a diameter of 11.8mm to provide a ledge 10 at the interruption 6.
  • the tool 20 shown in Figure 3 has a shaft 21 at one end 22 of which is a squared end to take a torque wrench or else as shown is drilled to take a pin to assist a manual grip.
  • a central drilling 26 and conical mouth 28 snugly fits head 3, the conical inner surface 30 corresponding to conical outer surface 5 of the nut.
  • three 2.5mm diameter balls 31 set into surface 30 so that slightly less than half protrudes into space 32 in the mouth 28.
  • Each ball 31 is arranged to engage with a groove 12 or 13 so that they draw the tool down onto the head 3 of the nut until they each reach the lower extremity of the grooves at which point surface 30 of the tool is drawn into engagement with surface 5 of the nut.
  • the tool now locks securely onto the nut for fully effective torque transmission.
  • M5 The size of balls 31 and the cooperating helical grooves depends on nut sizes.
  • M6 and M8 nuts will require 2.5mm balls, M10 and M12 nuts 3mm balls and M16 nuts 4mm balls.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Burglar Alarm Systems (AREA)
  • Dowels (AREA)
  • Toilet Supplies (AREA)
  • Surgical Instruments (AREA)

Claims (10)

  1. Dispositif de fixation (1) de vis de sécurité comprenant une tête (3) autour de laquelle on trouve une surface extérieure incurvée de réception d'outil (5), la surface étant au moins partiellement conique ou en forme de dôme, caractérisé en ce que plusieurs rainures gauche et droite (12, 13) sont formées dans la surface incurvée pour recevoir une saillie (31) à partir d'une surface intérieure (30) d'un outil (20) coopérant pour faire tourner le dispositif de fixation (1).
  2. Dispositif de fixation (1) selon la revendication 1, dans lequel six desdites rainures hélicoïdales (12, 13) sont formées à gauche et à droite sur la surface incurvée (5).
  3. Dispositif de fixation (1) selon l'une quelconque des revendications 1 et 2, dans lequel toutes ou chaque rainure hélicoïdales sont formées avec un angle de filetage de 10° à 20°.
  4. Dispositif de fixation (1) selon la revendication 3, dans lequel l'angle de filetage est sensiblement de 15°.
  5. Dispositif de fixation (1) selon l'une quelconque des revendications 1 à 4, dans lequel la surface incurvée est conique avec un angle de c8ne de 40° à 60°.
  6. Dispositif de fixation (1) selon la revendication 5, dans lequel l'angle de cône est sensiblement de 50°.
  7. Dispositif de fixation (1) selon la revendication 5, dans lequel la surface conique (5) se termine au niveau d'un point d'interruption (6) entre la tête (3) et la base (14) du dispositif de fixation pour proposer une arête (10), la forme du dispositif de fixation continuant vers la tête (3) selon un diamètre réduit.
  8. Dispositif de fixation (1) selon l'une quelconque des revendications 1 à 7, dans lequel les rainures (12, 13) ont un fond incurvé pour se mettre en prise avec une courbe correspondante d'une saillie incurvée (31) de l'outil (20) coopérant.
  9. Agencement de fixation comprenant le dispositif de fixation (1) selon une ou plusieurs des revendications 1 à 8, et un outil (20) coopérant pour faire tourner le dispositif de fixation (1), l'outil (20) ayant une surface interne (30) dans une bouche (28) de sorte qu'il se raccorde avec la surface extérieure incurvée (5) du dispositif de fixation (1), la surface interne (30) de l'outil (20) ayant des saillies (31) pour raccorder chaque rainure hélicoïdale (12, 13) du dispositif de fixation (1).
  10. Agencement selon la revendication 9, dans lequel la saillie ou les saillies (31) est (sont) une bille (des billes).
EP02785629A 2001-12-10 2002-12-10 Ecrou, boulon et vis de securite Expired - Lifetime EP1454070B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB0129504A GB2382853B (en) 2001-12-10 2001-12-10 Security nut, bolt and screw
GB0129504 2001-12-10
PCT/GB2002/005556 WO2003054398A1 (fr) 2001-12-10 2002-12-10 Ecrou, boulon et vis de securite

Publications (2)

Publication Number Publication Date
EP1454070A1 EP1454070A1 (fr) 2004-09-08
EP1454070B1 true EP1454070B1 (fr) 2005-11-30

Family

ID=9927325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02785629A Expired - Lifetime EP1454070B1 (fr) 2001-12-10 2002-12-10 Ecrou, boulon et vis de securite

Country Status (7)

Country Link
US (1) US7051624B2 (fr)
EP (1) EP1454070B1 (fr)
AT (1) ATE311544T1 (fr)
AU (1) AU2002350916A1 (fr)
DE (1) DE60207753D1 (fr)
GB (1) GB2382853B (fr)
WO (1) WO2003054398A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7188554B2 (en) * 2005-06-09 2007-03-13 Atlas Spine, Inc. Medical fastener and tool
US7596872B2 (en) * 2006-07-27 2009-10-06 Robert Bosch Gmbh Cutting attachment with a removable cover for rotary hand tools
US7310879B1 (en) 2006-07-27 2007-12-25 Robert Bosch Gmbh Cutting attachment having an adjustable foot for rotary hand tools
US8365694B2 (en) * 2007-08-01 2013-02-05 Ngk Spark Plug Co., Ltd. Easily removable spark plug
US10836304B2 (en) 2015-11-20 2020-11-17 Ian Taberner Security mounting arrangement
US9651193B1 (en) 2015-11-20 2017-05-16 Ian Taberner Security mounting arrangement
MX2019005377A (es) 2019-05-08 2019-10-07 Gildardo Blanco Barrera Gudalupe Dispositivo de seguridad para medios de rodamiento de vehiculos.

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB943521A (en) * 1961-05-24 1963-12-04 Eaton Mfg Co Fastener
US3134292A (en) * 1962-12-20 1964-05-26 Walton Marvin Irretrievable screw
US3302672A (en) * 1965-07-12 1967-02-07 Walton Marvin Screw driving tool
US3482481A (en) * 1968-10-24 1969-12-09 Strohm Newell Bolt or nut head
US4171662A (en) * 1976-12-20 1979-10-23 Wright Line Inc. Security screw
US4128038A (en) * 1977-11-23 1978-12-05 Pay Television Corporation Rotary drive fastener
IL67733A0 (en) * 1983-01-23 1983-05-15 Mekler Dan Tamper-proof fastener and snap on wrench for use therewith
GB2169978B (en) * 1985-01-21 1988-06-02 Derek Valentine Hall Safety fastening
GB2171040B (en) * 1985-02-14 1988-12-29 Dan Mekler Security fastener and wrench
DE3921874A1 (de) * 1989-07-04 1989-11-30 Hoehler Juergen Dipl Volksw Schraube mit einer senkausnehmung im kopf, an deren innenwand sich ein rechts- u. ein linksgewinde befinden. ein- u. ausdrehwerkzeug mit komplementaeren gewinden am aussenrand des teils, der zum ein- u. ausdrehen der schraube in die senkausnehmung eingeschraubt wird
US5381709A (en) * 1993-06-14 1995-01-17 Louw; John A. Application tool for torque-controlled fastening system
US5598753A (en) * 1995-02-07 1997-02-04 Lee; James S. Eagle wing tips tamper-proof fastener and driver tool
US6024522A (en) * 1997-04-24 2000-02-15 Mcgard, Inc. Security fastener and drive tool for driving both security fasteners and conventional fasteners
AUPQ158099A0 (en) * 1999-07-12 1999-08-05 Goodcart Pty Limited Security screw
US6341927B2 (en) * 1999-07-23 2002-01-29 Pinhead Components Inc. Tamper reistant fastener

Also Published As

Publication number Publication date
US20050002756A1 (en) 2005-01-06
WO2003054398A1 (fr) 2003-07-03
GB0129504D0 (en) 2002-01-30
ATE311544T1 (de) 2005-12-15
DE60207753D1 (de) 2006-01-05
US7051624B2 (en) 2006-05-30
AU2002350916A1 (en) 2003-07-09
GB2382853B (en) 2003-11-12
GB2382853A (en) 2003-06-11
EP1454070A1 (fr) 2004-09-08

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